The variance of dispersion measure of high-redshift transient objects as a probe of ionized bubble size during reionization
The variance of dispersion measure of high-redshift transient objects as a probe of ionized bubble size during reionization
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DOI：
10.1093/mnras/stx2462
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发表时间：
2017-09
影响因子：
4.8
通讯作者：
S. Yoshiura;Keitaro Takahashi
中科院分区：
文献类型：
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作者：
S. Yoshiura;Keitaro Takahashi
快速射电爆发等高红移瞬变天体的色散测量(DM)可以成为探测再电离时代星际介质的有力工具。在这篇文章中，我们研究了具有相同红移的物体的DMS的变化，作为电离气泡尺寸分布的潜在探测器。我们用一个带有随机分布的球形气泡的简单模型计算了DM的方差。结果表明，Dm方差反映了气泡尺寸的概率分布特征。我们发现，这种变化可以足够精确地测量，以便在一次红移中获得几百个源的典型大小的信息。
The dispersion measure (DM) of high-redshift $(z \gtrsim 6)$ transient objects such as Fast Radio Bursts can be a powerful tool to probe the intergalactic medium during the Epoch of Reionization. In this paper, we study the variance of the DMs of objects with the same redshift as a potential probe of the size distribution of ionized bubbles. We calculate the DM variance with a simple model with randomly-distributed spherical bubbles. It is found that the DM variance reflects the characteristics of the probability distribution of the bubble size. We find the variance can be measured precisely enough to obtain the information on the typical size with a few hundred sources at a single redshift.